Circumaortic left renal vein, also known as circumaortic renal collar is an anomaly of left renal vein when a supernumerary or accessory left renal vein passes posterior to the aorta, apart from the normal renal vein passing anterior to the aorta.Click to see full answer. Thereof, is Circumaortic left renal vein dangerous?Complications. During retroperitoneal surgery or nephrectomy, the surgeon may be falsely assured by the normal anterior renal vein, confidently clamp the aorta and mobilize the kidney. In this process, the retroaortic renal vein may shear off, leading to fatal hemorrhage.Subsequently, question is, can Nutcracker cause kidney failure? Prognosis. The “usual course” of renal nutcracker syndrome (NCS) is not clear and it remains under-diagnosed because symptoms vary from person to person. However, without treatment, it can predispose a person to left renal vein thrombosis (a blood clot in the vein) and kidney damage. Also question is, what does the left renal vein do? There are two renal veins, a left and a right. They branch off the inferior vena cava and drain oxygen-depleted blood from the kidneys. As they enter the kidneys, each vein separates into two parts. The posterior veins assist in draining the back section of each kidney, while the anterior veins assist the front part.Is Retroaortic left renal vein rare?A left renal vein passing behind the abdominal aorta is termed a retroaortic left renal vein (RLRV), and this anomaly is a relatively uncommon condition. Additionally, the congenital anomalies of the inferior vena cava (IVC) and its tributaries have become more frequently encountered in asymptomatic patients.

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